Coefficient of friction of contact lenses
The coefficient of friction refers to how the eyelids slip on contact lenses. During the day, we blink about 11,000 times. For this reason, it is imperative that contact lenses are very well lubricated and have a smooth, silky surface so that the person is as comfortable as possible.
It has been seen that the coefficient of friction is the most important characteristic for the contact lens user because at the end of the day the eyes must becomfortable, above the water content, the permeability of the oxygen or the elasticity